netdev - Issue with /etc/netns/${nsname}/hosts

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Message-ID: <CA+pPspp_b+50Z6+VNr4Y4K2BguHJZ9ykKCZ8j3aaFRkBOrbZGA@mail.gmail.com>
Date:	Tue, 1 Sep 2015 16:23:39 -0700
From:	James Loosli <loosli@...il.com>
To:	netdev@...r.kernel.org
Subject: Issue with /etc/netns/${nsname}/hosts

I seem to have an issue with using namespace-specific hosts files.
Here's an example.

I have different entries for foo.com in my hosts file for the
namespace and the system-wide hosts file;

root@...ver-01 Tue Sep 01 04:15:02pm
> cat /etc/netns/nsXX-XXX-240-3/hosts | grep foo
1.2.3.4 foo.com
root@...ver-01 Tue Sep 01 04:15:15pm
> ip netns exec nsXX-XXX-240-3 cat /etc/hosts | grep foo
1.2.3.4 foo.com
root@...ver-01 Tue Sep 01 04:15:19pm
> cat /etc/hosts | grep foo
0.0.0.0 foo.com

But when I try to get curl, ping or other utilities to use that hosts
file entry, they ignore the namespace-specific file.

root@...ver-01 Tue Sep 01 04:16:02pm
> ip netns exec ns91-227-240-3 curl -vv foo.com
* About to connect() to foo.com port 80 (#0)
*   Trying 0.0.0.0...
* Connection refused
* couldn't connect to host
* Closing connection #0
curl: (7) couldn't connect to host
root@...ver-01 Tue Sep 01 04:16:08pm
> curl -vv foo.com
* About to connect() to foo.com port 80 (#0)
*   Trying 0.0.0.0...
* Connection refused
* couldn't connect to host
* Closing connection #0
curl: (7) couldn't connect to host

Not sure what I'm doing wrong, but this behavior seems to contradict
what I find in the manpages for iproute2 and netns /etc files. Could
this be permissions related?

Regards,

James Loosli
949.439.6109
loosli@...il.com
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